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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Summary of Common Stock Reserved for Future Issuance
The following table presents common stock reserved for future issuance for the following equity instruments as of December 31, 2018 and 2017 (in thousands):
 December 31,
 20182017
Stock options and RSUs outstanding4,033 3,651 
Warrants to purchase common stock28 38 
Available for future issuance under employee equity plans1,684 872 
Total common stock reserved for future issuance 5,745 4,561